Wildfire smoke — the Silverado/Bond defining pattern.
The October 2020 Silverado Fire burned Portola Springs and Orchard Hills directly, and the December 2020 Bond Fire burned Silverado Canyon east of Irvine. HVAC systems community-wide pulled wildfire smoke composite — burned structures, plastics, vehicles, and household contents mixed with wildland fuels — into master-planned homes, multi-family complexes, and tech commercial spaces. Attic insulation, soft goods, and porous materials absorbed heavily.